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Registered Member #75
Joined: Thu Feb 09 2006, 09:30AM
Location: Montana, USA
Posts: 711
I fact I am using a one of those 40VA xfmrs on my DRSSTC as well, and I don't see it hurting performance. Of course, if I turn the bps up too high, it gets terribly hot (I think it is supplying more than 100W that way), and at some point the voltage drops, but for low power runs, I think it is perfect. In fact, it has the added benefit of the "series lightbuilb trick", limiting the current in case of a fault.
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
They are actually two small transformers, one of them wired backwards. Interestingly I get very little voltage drop on it, and coil draws only few watts at low breakrates with 100us ontime. Annd coil simply doesn't want to draw any more power!
I can't get 'rid' of it, since I wanted lower voltage on bridge for low power test.
EDIT: I measured primary current. With current 100V input it hits about 40-50A.
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
Primary current seems much too low for 100V on the bridge. You should be on the order of a few hundred amps based on my experience, even more if your primary is tuned lower than natural frequency of secondary.
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DRSSTC - cannot get oscillating
